The "NS_IMAGE" constant, which you use in your LocalSettings.php, has
been replaced by "NS_FILE" and removed in MediaWiki 1.34 (a while ago).
It looks like PHP 7.4 was just ignoring it (and presumably some of the
configuration you intended for the Image/File namespace was not applying
correctly), but PHP 8 treats it as an error.
The solution is to just replace all occurrences of NS_IMAGE with NS_FILE
(and NS_IMAGE_TALK with NS_FILE_TALK).
(Congrats on running MediaWiki for long enough that your configuration
still used NS_IMAGE ;) )
--
Bartosz Dziewoński
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